7.5cwt Opal. Natural Untreated Earth Mined Opal . October Birthday.

20x 17 x5 mm. October Birthday. If you are not sure how big this is , make certain you check on a measure marked in millimeters... the standard for measuring gems.

IMPORTANT NOTE: The black spots are natural, small dendrite inclusions that show under magnification, but hardly visible to the naked eye.
A video of this gem is available on request.

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